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Supercritical water nuclear reactor utilizing sleeve fuel assembly

A fuel assembly and supercritical water technology, applied in reactors, reactor fuel elements, nuclear engineering, etc., can solve problems such as high operating pressure and inapplicability, improve safety, reduce neutron parasitic absorption, shorten research and development cycle and The effect of R&D spending

Inactive Publication Date: 2005-11-23
张育曼 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the water temperature in a supercritical water reactor can be as high as 500-620°C and the operating pressure is as high as 25 MPa, the fuel rods (zirconium cladding package with an outer diameter of about 1 cm or so) widely used in existing water reactors 2 Cylindrical pellets, internally inflated) are no longer applicable, and fuel elements with new cladding materials need to be developed

Method used

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  • Supercritical water nuclear reactor utilizing sleeve fuel assembly
  • Supercritical water nuclear reactor utilizing sleeve fuel assembly
  • Supercritical water nuclear reactor utilizing sleeve fuel assembly

Examples

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Embodiment 1

[0028] Such as figure 1 , image 3 As shown, in an embodiment of a supercritical water nuclear reactor with an electric power of 250Mwe (thermal power of 570Mwt) using casing fuel assemblies, the pressure vessel 1 is manufactured by the current PWR mature technology, and its structure is the same as that of the current PWR pressure vessel . Since the inner wall of the pressure vessel only contacts the inlet water (about 280°C), the material can be carbon steel with a stainless steel lining, and the pressure vessel 1 is provided with a core 2 and a control rod bundle mechanism. The area above the core in the pressure vessel is divided into an upper part and a lower part by a thermal insulation partition, the lower part is the inlet water area 4, and the upper part is the outlet water area 5. There are two ways to isolate the inlet water and the outlet water. One is that the pressure shell 1 is respectively provided with a water inlet nozzle 6 communicating with the inlet wate...

Embodiment 2

[0031] Another embodiment of the present invention is a supercritical water nuclear reactor adopting a vertical pressure tube casing fuel assembly, including a steel shell and a core and a control rod bundle mechanism placed in the steel shell, and the core is composed of several casings The fuel assembly is composed of the structure of the casing fuel assembly as shown in Figure 8, and each casing fuel assembly includes a coaxial outer casing 13, a middle casing 14, and a center pipe 15, and the gap between the middle casing 14 and the center pipe 15 UO encapsulated by multi-layer SiC-PyC with a millimeter diameter in the annular space 2 The small spherical nuclear fuel element forms an annular fixed bed 16 of coated particles. The outer sleeve 13 is a stainless steel pressure tube that can withstand the design pressure of a supercritical water reactor. The wall thickness is 6.6mm. The outer sleeve 13 is provided with a bundle for Insert the zirconium alloy guide tube of the ...

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Abstract

The invention relates to a super critical water nuclear reactor, which adopts external pipe fuel assembly in the field of nuclear reactor works technology. The external tube fuel assembly comprises concentric outer tube, inner tube and center tube, wherein the annular space between inner tube and center tube has unclear fuel element which has millimeter diameter and has UO2 small ball which is covered with multilayer SiC-PyC; inlet water enters into outer weir which is formed by outer tube and inner tube and then goes through inner tube and covering particle posited bed to directly cool covering particle, with the cooling water heated and gone through slotted hole of center tube and entered into center tube, at last dropped off center tube. It can adopt pressure shell type or design the outer tube into bearing pressure tube, which can bear super water designing pressure.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor engineering, and in particular relates to a supercritical water nuclear reactor adopting casing fuel assemblies. Background technique [0002] The operating pressure of the supercritical water nuclear reactor is 23 MPa higher than the critical point of water. The water is a single medium. The water in the reactor does not undergo a phase change. The water temperature is as high as 510-620 ° C. The direct thermal cycle is adopted, so its net thermal efficiency can reach 45%. It is 1 / 3 higher than today's light water reactors, and can save more than 30% of uranium resources when used for power generation, and simplifies the configuration of water reactors to the greatest extent, without the need for steam generators, main circulation pumps, and pressurizers , steam separator and dryer. The supercritical water reactor nuclear power plant can not only utilize the mature light water reactor te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C1/00
CPCY02E30/40Y02E30/30
Inventor 张育曼李玉崙
Owner 张育曼
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